Electronic Design

Thermal Protectors Feature Dual-Spring Mechanisms

A family of three thermal protectors from Selco Products offers high-reliability overheat protection, automatic reset, a dual-spring-mechanism design, and sharp "snap-action" sound when activated. The dual-spring design includes strong shock and vibration resistance to ensure extremely stable contact performance.

The JP7 targets ac equipment in harsh industrial conditions (see figure). It comes in a 17.0- by 7.3- by 3.9-mm package and an operating temperature set range from 75°C to 150°C. The EP2 devices feature the same mechanical design as the JP7 but employ a different casing material designed specifically for protecting low-voltage dc equipment. The temperature set point range is from 75°C to 130°C.

The BP thermal protectors are for rechargeable battery packs. They automatically turn off the voltage if the batteries overheat. The BP series comes in four configurations that handle a wide variety of battery types, including nickel cadmium, lithium-ion, and nickel metal hydride.

All of the configurations have a differential temperature of 46°C or higher. Their operating set range is from 70°C to 100°C. Standard list price for the thermal protectors is $2.60 each in quantities of 1000. Delivery is in four to six weeks.

Selco Products www.selcoproducts.com

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